9fa588566f
This commit does a number of things to start the transition of channels from kernel to user space: - Remove channel objects / syscalls from the kernel - Add mutex type in libj6 - Add condition type in libj6 - Add a `ring` type flag for VMA syscalls to create ring buffers - Implement a rudimentary shared memory channel using all of the above
38 lines
808 B
C++
38 lines
808 B
C++
// The kernel depends on libj6 for some shared code,
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// but should not include the user-specific code.
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#ifndef __j6kernel
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#include <j6/condition.hh>
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#include <j6/errors.h>
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#include <j6/syscalls.h>
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#include <j6/syslog.hh>
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namespace j6 {
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void
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condition::wait()
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{
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j6::syslog("Waiting on condition %lx", this);
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uint32_t v = __atomic_add_fetch(&m_state, 1, __ATOMIC_ACQ_REL);
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j6_status_t s = j6_futex_wait(&m_state, v, 0);
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while (s == j6_status_futex_changed) {
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v = m_state;
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if (v == 0) break;
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s = j6_futex_wait(&m_state, v, 0);
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}
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j6::syslog("Woke on condition %lx", this);
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}
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void
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condition::wake()
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{
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uint32_t v = __atomic_exchange_n(&m_state, 0, __ATOMIC_ACQ_REL);
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if (v)
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j6_futex_wake(&m_state, 0);
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}
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} // namespace j6
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#endif // __j6kernel
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